DETERMINATION OF ROCK SPECIMEN MECHANICAL PROPERTIES Russian patent published in 2014 - IPC E21C39/00 G01N3/08 

FIELD: mining.

SUBSTANCE: specimen is loaded by two spherical indenters directed in opposition till its cracking. Destructive force is registered to define cracking surface area in destructed specimen that extends through loading axis, geometrical parameters of destructed zones in areas of contact with spherical indenters, specimen rupture stretching stress and mean compressive stress at the boundary of the larger of destructed zones are calculated. Breaking point and shear resistance are defined as mechanical properties of the specimen. Debris of crushed specimen are used to compose a composite specimen for determination of geometrical parameters of crushed zones at the ends of said composite specimen. Diameter of residual marks of indenters and indent hole length along fracture surface are defined. Surface area of larger destructed zone at contact with indenters, breaking point at uniform stretching, maximum shear resistance and Poisson factor are defined by the formulas.

EFFECT: simplified tests, higher precision of determination of mechanical properties.

5 tbl, 2 dwg